Maintaining proper air pressure in your reverse osmosis (RO) storage tank is crucial for optimal system performance, ensuring a steady and strong flow of purified water from your faucet. This process involves checking the existing pressure and adding air as needed.
Why RO Tank Pressure Matters
An RO system filters water slowly, so a pressurized storage tank is essential to collect and store purified water. This tank uses an internal air bladder to push the water out through your faucet when needed. If the air pressure inside the tank is too low, the water flow from your RO faucet will be sluggish or stop entirely, even if the tank itself is full.
Tools You'll Need
To properly pressurize your RO tank, gather these simple tools:
- Tire Pressure Gauge: A standard automotive or bicycle tire gauge works perfectly.
- Air Pump: A bicycle pump, a small portable air compressor, or even a hand pump can be used.
- Wrench (Optional): For disconnecting the tank if necessary, though often not required.
Step-by-Step Guide to Pressurizing Your RO Tank
Follow these steps to accurately check and adjust the air pressure in your RO tank:
-
Shut Off Water Supply:
- Locate the cold water line connected to your RO system and turn off the feed water valve.
- Turn off the shut-off valve on top of the RO storage tank itself (if present).
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Drain the RO Tank Completely:
- Open your dedicated RO faucet at the sink.
- Allow all the water to drain from the tank. This step is critical, as the tank must be completely empty of water to get an accurate air pressure reading.
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Locate the Air Valve:
- The air valve is typically found on the side or bottom of the RO tank. It often resembles a tire valve stem and is usually protected by a blue plastic cap. Remove this cap.
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Check Current Pressure:
- Attach your pressure gauge firmly to the air valve.
- Note the reading on the gauge.
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Add Air if Needed:
- If the pressure is below the recommended level for your tank size, connect your air compressor or bicycle pump to the valve.
- Pump air into the tank in short bursts.
- Periodically remove the pump and re-check the pressure with your gauge to avoid over-pressurizing.
-
Verify Pressure and Reassemble:
- Once the desired pressure is reached (refer to the table below), remove the gauge and replace the blue plastic cap.
- Close the RO faucet.
- Turn the RO tank's shut-off valve back on.
- Turn the main feed water valve to the RO system back on.
-
Refill and Flush:
- Allow the RO tank to refill completely, which can take several hours.
- After refilling, open the RO faucet and drain the tank completely one or two times. This flushes out any residual air that may have entered the water line and helps reseat the internal bladder.
Recommended RO Tank Pressures
The ideal air pressure for an empty RO storage tank can vary slightly by manufacturer and tank size. Here are common recommendations:
| RO Tank Size | Recommended Air Pressure (Empty) |
|---|---|
| 4 Gallons | 5 psi |
| 14 Gallons | 7 psi |
| Other Sizes | Consult Manufacturer Specs |
It's always best to check your specific RO system's manual or the tank's label for the precise recommended pressure.
When to Check Your RO Tank Pressure
Regular maintenance is key to a well-functioning RO system. You should check your RO tank's pressure:
- Annually: As part of your routine RO system maintenance.
- When Flow is Slow: If you notice a significant decrease in water flow from your RO faucet, even when the tank feels full.
- After Membrane Replacement: When performing other major maintenance on your RO system.
By following these steps, you can ensure your reverse osmosis system continues to provide clean, clear water with optimal flow. For more detailed troubleshooting and maintenance tips, consider consulting resources like Fresh Water Systems Reverse Osmosis Storage Tank Pressure Troubleshooting.
